City of Winnipeg...PICA, under contract with the City of Winnipeg (RFP 495-2018), inspected two 24in river crossing feeder mains for the City of Winnipeg using Remote Field Testing

City of Winnipeg 600 mm Kildonan-Redwood Feeder Main

Condition Assessment Report, Standard Analysis

PICA- Pipeline Inspection & Condition Analysis Corporation

(A Subsidiary of Russell NDT Holdings Ltd.)

24in Potable Water Chimera RFT ILI Tool

600mm CML Spiral Welded Steel Pipe

Red River Crossing – RFP 495-2018

Redwood Ave from Main St to Glenwood Cr

Winnipeg, Manitoba

PICA Project: 8054

Inspection Date:

Report Submission:

Operators:

Analyst:

Reviewers:

Report Revision:

March 26-27, 2019

August 26, 2019; June 11, 2019 (rev 1.0)

D. Burton, A. Russell, P. Ryhanen, B. Senka, A. Shatat

A. Liwoch

M. Chia, A. Shatat

1.0 CONFIDENTIAL

CONFIDENTIAL P a g e | 2 CITY OF WINNIPEG 600 mm KILDONAN-REDWOOD FEEDER MAIN

Table of Contents Executive Summary ........................................................................................................................ 3

Pipeline Inspection Background ......................................................................................................7

Inspection Details ........................................................................................................................... 9

RFT Inspection Preparation ........................................................................................................ 9

RFT Inspection Procedure .........................................................................................................10

Vertical Pipe at West Chamber ...............................................................................................10

Horizontal Pipe from East Chamber to Cast Iron Elbow ....................................................... 11

Analysis Results ............................................................................................................................. 14

Location Reporting, Pipe Lengths & Features ........................................................................... 14

General Wall Thickness .............................................................................................................. 16

Local Wall Thickness .................................................................................................................. 17

Data Quality ............................................................................................................................... 17

Visual Inspection ....................................................................................................................... 22

Disclaimer – PICA Corporation .................................................................................................... 25

Scope of Services ....................................................................................................................... 25

Standard of Care........................................................................................................................ 25

Appendix 1 : Colour Maps of Signal Indications .......................................................................... 26

Appendix 2 : RFT Tool Calibration ............................................................................................... 37

Appendix 3 : Job Notes and Tool Log ........................................................................................... 39


City of Winnipeg: 600mm Kildonan-Redwood Feeder Main Condition Assessment Report, Standard Analysis

Executive Summary

PICA, under contract with the City of Winnipeg (RFP 495-2018), inspected two 24in river crossing

feeder mains for the City of Winnipeg using Remote Field Testing (RFT) Technology from March

26-28, 2019. The inspected lines are referred to as the Kildonan-Redwood Feeder Main and the

Charleswood-Assiniboia Feeder Main. This report documents the inspection results for the 24in

Kildonan-Redwood line, which crosses beneath the Red River. The inspected portion spanned

between chambers on the east and west sides of Red River (refer to the line map in Figure 4). The

inspection was performed on March 26 and 27, 2019, with a supplementary visual inspection of

accessible piping performed on March 30th. This report documents PICA’s findings.

In general, the feeder main was found to be in good condition. Nine (9) pipes were found to show

evidence of pitting corrosion with a total of 18 localized pitting indications reported. Of these 18

indications, 11 indications measured to be “shallow” (≥65% RW), and 7 indications measured to

be “medium” (40-64% RW).

A listing of all logged anomalies together with detailed analysis information can be found in the

companion document, “PICA Inspection Results - 24in Kildonan Feeder Main (rev1.1).xlsx”.

Figure 1 and Figure 2 illustrate the axial and circumferential distribution of localized defect

indications along the Kildonan-Redwood Feeder Main. Note that some data points partially

overlap due to proximity. Clock position information cannot be provided for the low confidence

indication within the vertical pipe 0340, so it is not shown in Figure 2.

A condition assessment summary detailing the top three defect indications, minimum and

maximum circumferential remaining wall, and pipe average remaining wall (PARW) values for

each pipe segment (greater than 2.11m in length) of the Feeder Main river crossing is provided in

Figure 3. One pipe segment (0210) had a recorded average wall thickness more than 115%

remaining wall, indicating a different pipe type with heavier wall thickness compared to those

specified in construction records provided to PICA. Pipe segment 0340 is a single vertical pipe

located in the chamber shaft on the west side of the Red River. This pipe segment has a greater

nominal wall thickness value (12.7mm) than the other pipes (7.9mm) and was therefore scanned

using a different frequency during the RFT inspection.

Various areas of interest were identified during a visual inspection of accessible piping within the

Tunnel located on the west side of the river. These areas of interest included damage to the coating

in the form of gauges and scratches, and imprints possibly left from transport or construction

equipment. No visual damage to the external coating was observed at the anomaly locations

flagged in the RFT data.


Table 1. Overview of the RFT findings for the 600mm Kildonan-Redwood Feeder Main

Table 1: Feature Indication Summary

Inspected Length 237.76m

Number of Pipe Sections: 34

Number of Analyzed Pipe Sections: 34

Number of Elbows: One 90°

(Long Rad. CI, 25.4mm NWT)

Thinnest circumferential pipe wall (Tcircmin) (RW%): 96% (in pipe 0140)

Number of pipes without localized wall loss indications:

25

Number of pipes with localized wall loss indications: 9

Number of indications with >65% RW: 11

Number of indications with 40-65% RW: 7

Number of indications with <40% RW: 0

Total number of wall loss indications reported: 18

Total Number of Connections: 34

Number of Flange-Pair Connections: 25

Number of Victaulic Couplings: 5

Number of Dresser Couplings: 1

Number of Welds 3

Number of Open Flange Faces: 1


Figure 1. Axial distribution of defect indications and remaining wall (%) within the scanned length of the Kildonan-Redwood Feeder Main

Figure 2. Circumferential distribution of pitting regions along the Kildonan-Redwood Feeder Main, described with clock positions referenced by looking from east to west. Note that the defect reported in

pipe 0340 is not included in chart as clock position information is not available for this pipe.

CROWN

CROWN

INVERT


Figure 3. Condition assessment summary for the Kildonan-Redwood Feeder Main. Pipes less than 2.11 meters in length were not analyzed for pipe average remaining wall values. Pipe 0340 is the vertical pipe on the west side of the Red River and has a wall thickness of 12.7mm,

differing from 7.9mm pipe wall thickness which was documented for the horizontal piping in drawing 12530. This pipe’s Tavg is set to 100%.


Pipeline Inspection Background

The Kildonan-Redwood Feeder Main is a 600mm (24-inch) diameter steel main transporting

potable water. A dual tethered Remote Field Technology (RFT) inspection of the feeder main was

conducted by PICA on March 28th, 2019. The section inspected by PICA crosses beneath the Red

River and extended between two access chambers east and west of the river (located along

Redwood Avenue).

Table 2. Pipeline and RFT inspection information for the 600mm Kildonan-Redwood Feeder Main river crossing

Client: City of Winnipeg Location: Redwood Ave from Main St to Glenwood Cr Winnipeg, Manitoba Line Name/ Identifier:

Kildonan-Redwood Feeder Main

Product: Potable Water Pipe Diameter: 600 mm (24-inch) Material: Steel, spiral welded; One Cast Iron elbow (90°) NWT: (Steel) 7.9 mm (horizontal piping) and 12.7 mm (vertical pipe) Grade: Internal Liner: Coal Tar Epoxy, ~4mm thick External Coating:

Asphalt dipped felt

Bends: Mitered: Two 20°; 13°, 7°, 12°; Radiused: one LR CI 90° elbow Joint Type: Welding Flanges; Victaulic couplings; Welds Age: 65 yrs. (1954) RFT Inspection Access Locations:

Chambers east and west of river, along Redwood Ave

Elevation GPS Coordinates East Chamber: 231m 49°54’56.81”N, 97°07’30.55”W West Chamber: 232m 49°54’59.55”N, 97°07’40.96”W RFT Inspection Length:

Vertical Portion: 10.80m Horizontal Portion: 225.60m

Reported Inspection Direction:

East to West

The Kildonan-Redwood Feeder Main was divided into two inspection lengths separated by a

90-degree cast iron elbow. Due to the unknown ID of the cast iron elbow, it was not attempted to

pull the Chimera tool through the elbow. The 90-degree cast iron elbow is located at the bottom

of the West Chamber, within an access tunnel that extends approximately 49.02 meters southeast

towards the river. The 600 mm Feeder Main runs through this tunnel, and past the end of the

tunnel to the opposite bank of the Red River.

The two inspection lengths are:

1) Vertical pipe section at the West Chamber (10.80m length) extending down to the 90-

degree elbow at the bottom of the vertical shaft.

2) Horizontal piping (225.60m length) from the East Chamber to the east facing flange face

of the 90-degree cast iron elbow at the bottom of the vertical shaft at the West Chamber.


Figure 4 shows an overview map of the Kildonan-Redwood Feeder Main section inspected by PICA that crosses beneath the Red River,

and the profile drawing of the Feeder Main section.

Figure 4. Profile drawing (Drawing No. 12529) and overview path map (Google Earth) of the Kildonan-Redwood Feeder Main that was inspected by PICA during the March 2019 mobilization, which crosses beneath the Red River (source: Google Earth)

West Bank

AGM

East Bank

AGM

Wes

t C

ha

mb

er

Ea

st C

ha

mb

er

90° elbow

Inspection Path


Inspection Details

RFT Inspection Preparation

Prior to performing the RFT inspection, all available Critical Application Information (CAI) was

reviewed including drawings and measurements of pipes and wall thicknesses provided by the

client and subcontractor to ensure a successful inspection.

In advance of the RFT in-line inspection (ILI), the pipeline section was isolated, and a line

cleaning was performed. A gauge pig was pulled through the horizontal portion of the Main by

J-Con to confirm the minimum bore of the section and ensure Chimera RFT tool passage. A

tagline was left through the entire length of the river crossing after preparatory activities for use

during the RFT inspection of the Main.

To facilitate the inspection, winches were positioned at the East and West Chambers. The

winchline at the West Chamber was connected to the tagline in the pipe. The tagline and

connected winchline from the West side winch were pulled up on the East side of the river to be

connected to the Chimera RFT ILI tool for the dual tethered inspection runs.

Before contacting the Main, the RFT Chimera tool assembly was sprayed with a 200mg/L free

chlorine disinfecting solution (Figure 5). The tool was then lowered into the West Chamber to

begin the inspection of the vertical piping section (Figure 6).

Figure 5. Disinfecting the Chimera assembly using a 200 mg/L free chlorine solution

Figure 6. Chimera tool being lowered into the chamber on the west side of the river crossing


RFT Inspection Procedure

Vertical Pipe at West Chamber

The vertical portion (on the west side of the

river) of the Kildonan-Redwood Feeder Main

was inspected first. The winch positioned at the

West Chamber (Figure 8) was used to lower the

tethered tool into the chamber and into the

vertical piping (Figure 7). The winchline

odometer as well as the on-board odometers

were zeroed with the Chimera tool’s odometer

wheels flush with the pipe opening. For the first

run, the RFT tool’s detector module was leading

(first to enter pipe) scanning at a frequency of 7

Hz.

Once the tool reached the 90-degree cast iron at

the bottom of the vertical piping, the winch was

stopped, and the pull was reversed to bring the

Chimera tool back up to be extracted from the

pipe.

Figure 8. Winch set-up on west side of Red River. Figure 9. East side of Red River winch set-up.

Figure 7. Looking down into West Chamber from above. Chimera tool is in vertical steel pipe.


The total length of the vertical portion of the Main

is documented as 10.91m, and was measured by the

Chimera RFT tool’s odometers as spanning 10.80

meters in length. Figure 10 shows an image taken

from the tunnel showing the vertical piping

extending from the tunnel up to the West Chamber.

A second run was performed with the Chimera’s

exciter module leading, and a third run with the

detector module again leading, both runs completed

at a frequency of 5 Hz. Once the tool was received

for the final time at the top of the vertical shaft in

the West Chamber, data was downloaded, and the

Chimera was disconnected from the winchlines. The

Chimera RFT tool was brought to the East Chamber

to begin the inspection of the horizontal portion of

the Feeder Main.

Horizontal Pipe from East Chamber to Cast Iron

Elbow

A second winch was positioned at the East Chamber

(Figure 9) to enable a dual tethered inspection of the

horizontal section of the Feeder main.

First, the winchline from the winch at the West

Chamber was pulled through the pipeline to allow

connection to the tool in the East Chamber.

The tool was lowered into the chamber on the East

side of the river (Figure 11). Winchlines from the

East and West access locations were connected to

either end of the Chimera tool and the tool was then

inserted into the pipe in the East Chamber with the

detector module leading (facing west).

Using the winches, the Chimera was pulled from the

East Chamber (Figure 12, Figure 13) west towards

the 90-degree elbow in the tunnel on the west side

of the Red River. The tool scanned at a frequency of

14 Hz, traveling at a velocity of 2.1 m/min. Once the

tool had reached the elbow, the pull was reversed,

and the Chimera was brought back to the East

Chamber. The distance the tool traveled (in one

direction) for this portion of the pipeline was 225.60 meters, with data being collected successfully

over the entire inspected length. The length of the inspected portion was measured from the open

pipe end in the east chamber.

Figure 11. Chimera tool being lowered into East Chamber to inspect the horizontal

portion of the Feeder Main.

Figure 10. Looking up vertical shaft from tunnel. Image shows the vertical steel pipe portion of the Kildonan-Redwood Feeder

Main.


Due to the use of flange connections in the construction of this portion of the Feeder Main,

multiple inspection runs were necessary to collect RFT data for the full length of the pipeline. As

a result, two additional runs were completed on the following day; one inspection run was

conducted at 14Hz, with the tool’s exciter module leading, and one 10Hz inspection run was

conducted with the detector module leading, targeting the tunnel section of the force main.

During the inspection of the horizontal section of the Feeder Main, PICA’s custom Above Ground

Monitors (AGMs) were used as an additional source of positional information. AGM units were

positioned above the pipeline on both the east (Figure 14) and west (Figure 15) banks of the Red

River so that the underwater portion of the Feeder Main could be identified in the data during

analysis and reporting. These units are designed to pick up the signal from the RFT ILI tool and

are used to track the location and time of passage of the tool during inspections.

Figure 12. Chimera with trailing pig loaded into the pipe in the East Chamber.

Figure 13. Looking into pipe from the East Chamber towards first downward

deflection.

Figure 15. AGM units on the west side of the Red River

Figure 14. AGM unit on the east side of the Red River, recording tool passage


Following the completion of the RFT inspection, a visual inspection was conducted on the

horizontal portion of the Main that runs through the tunnel (Figure 16) on the west side of the

Red River. Measurements were taken of construction features such as the straps, Victaulic

couplings and flange pair connections (Figure 17). Details about the visual investigation can be

found in the section Analysis Results – Visual Inspection.

Figure 16. Visual investigation of the horizontal portion of the Kildonan-Redwood Feeder Main within the tunnel on the west side of the river.

Figure 17. Measurements were taken of construction features within the horizontal portion

of the pipe in the tunnel on the west side of the river.


Analysis Results

For reporting purposes, the Zero Reference Datum (ZRD) point was set to the open face of the

pipe in the East Chamber. The End Reference Datum (ERD) was established at the open flange

face at the top of the vertical pipe in the West Chamber. Pipe segments are therefore reported

from east to west, and pitting indications described with clock positions referenced by facing west.

Distances stated in this report refer to the distance from the ZRD at the East Chamber unless

otherwise noted.

Multiple data sets were collected during the inspection of the Kildonan-Redwood Feeder Main.

Three runs were completed within the vertical pipe section at the West Chamber, resulting in six

data sets being collected. These runs were performed at 5Hz and 7Hz frequencies, and with the

tool’s orientation flipped for one of the runs.

Three runs were completed within the horizontal piping section of the Feeder Main, which also

resulted in six data sets being collected. Two runs were performed at 14Hz with the detector and

exciter orientation alternating, and one run was performed at 10Hz, with the tool’s detector

leading. For the 14Hz inspections, only the launch portions (east to west runs), were acquired at

the optimal inspection velocity. The 10Hz inspection run targeted the tunnel section of the force

main, and an optimal inspection velocity was achieved for the launch portion of the inspection

run from approximately 127.28m to the 90-degree elbow.

The three data sets gathered at the proper inspection velocities were compared and analyzed for

defect indications, with recorded indications correlated between the data sets. This provides a

high level of confidence in the location and sizing of the reported defect indications. Odometer

and Inertial Measurement Unit (IMU) data were compared between all six data sets.

Location Reporting, Pipe Lengths & Features

Resource information collected and reviewed during the inspection project was used to supply the

most accurate summary of positional information for each of the reported potential wall loss

indications. This information included data collected by an Inertial Measurement Unitwhich

recorded the pitch, yaw and roll of the Chimera tool as it was pulled through the pipeline; AGM

passage locations; and physical measurements of accessible piping. This information was

compared with the client supplied drawings of the Feeder Main and was used for corroboration

of reported construction feature and wall loss indications.

A visual inspection was performed on the accessible portion of the Main that runs through the

tunnel on the west side of the Red River. During the visual inspection, measurements of pipe

lengths, connection types, and other key areas of interest were taken. Pipe segment lengths

recorded with the Chimera tool’s on-board odometers correlate well with the physically measured

pipe segments within the tunnel.

The total length inspected of the Kildonan-Redwood Feeder Main was 237.76m. The Main was

constructed with pipe segments of various lengths, most measuring around either 12.15m (~40.9

feet) or 4.25m (~13.9 feet). Some discrepancies were found between the client records and RFT

findings. The length of the horizontal portion of the Feeder Main was expected to be 231.34

meters; however, during review of the data collected during the inspection, the length was


measured to be 225.60m. This 5.74m difference is thought to be mostly due to errors within the

construction records, partially related to the piping modifications made for access in the East

Chamber (pipe 0010).

Pipe number 0330 measured 2.0m shorter in length than described in client records (detail “11”

in drawing No. 12530). Physical measurements were taken during the visual inspection, which

confirmed the reported length of pipe 0330 to be 3.95m (instead of 6.09m).

The length of the 90-degree elbow at the bottom of the west shaft was estimated at 1.36m, based

on the dimensions of an AWWA 90° long sweep bend found in the CIPRA 2952 Cast Iron Pipe

Handbook.. The actual length of the elbow may differ from this estimated centerline length.

Pipe segments were connected primarily with flanges, though five Victaulic Couplings and one

Dresser Coupling were also identified in client provided drawings. Record drawing number 12530

details two pipe segments joined with a Dresser Coupling (detail “5”), spanning 12’0” (3.66m)

together. These two pipe segments measured 1.54 and 2.37 meters in length respectively, using

odometer data that was recorded during the RFT inspection.

Two connections at the east side of the river

crossing are thought to be welds, concurrent

with suspected Dresser Style 63 connection

rings. These two connections join pipe segments

0010 with 0020, and 0020 with 0030. Pipe

0010 is the white-painted pup piece that was

welded to the main in the East Chamber. This

pipe segment measures approximately 0.7m in

length (please note that odometer data collected

at the very beginning of the pipeline is poor in

quality due to inconsistencies in the velocity of

the RFT tool as it is brought up to the target

inspection velocity). Figure 18 shows an image

of the pup piece photographed in the East

Chamber during one of the inspection runs.

A third girth weld was identified between pipes

0030 and 0040. At the connection between

these two pipe segments, a pitch change

of -6.0 degrees was recorded by the on-board

IMU module, while a -5.6-degree pitch change

was recorded at the flange connection between pipes 0040 and 0050. Client records provided to

PICA report a 12-degree vertical bend between pipes detailed “9” (PICA pipe number 0050) and

“10” (pipe 0040) (drawing 12530). This documented 12-degree bend is thought to be inaccurate,

as the RFT weld indications as well as the corresponding pitch changes were recorded in all data

sets collected during the condition assessment. Table 3 provides a summary of construction

features noted in collected data from the inspection of the Kildonan-Redwood Feeder Main.

Figure 18. Short segment of pipe in the East Chamber.


Table 3. Summary of construction features recorded during the RFT inspection of the 600mm Kildonan-Redwood Feeder Main. Connections not mentioned in table are flange pairs which make up most pipe connections.

Distance (m) Pipe Number Description 0.68 0020 Weld 1.43 0030 Weld 2.65 0040 Weld

163.75 0190 Dresser Coupling 166.58 0200 Possible Water Stop 172.62 0210 Strap 174.68 0220 Victaulic Coupling 175.31 0220 Possible Water Stop 180.60 0230 Strap 186.74 0240 Strap 187.49 0250 Victaulic Coupling 193.56 0260 Strap 199.73 0270 Strap 200.29 0280 Victaulic Coupling 206.41 0290 Strap 212.52 0300 Strap 213.10 0310 Victaulic Coupling 219.20 0320 Strap 221.64 0330 Victaulic Coupling 226.28 Between 0330, 0340 90-Degree Elbow** 229.96 0340 Stiffener 232.38 0340 Stiffener 235.11 0340 Stiffener

*Connection types refer to start of pipe number given

**90-degree elbow length is estimated based on the dimensions of an AWWA 90˚ long sweep elbow as documented on

pg266 of the CIPRA 1952 Cast Iron Pipe Handbook.

General Wall Thickness

Pipe sections longer than 2.11m were analyzed to obtain the Pipe Average Remaining Wall

(PARW) thickness calculated over the length of the inspected section. This value is reported as

the “Tavg” RW in Table 4. The Chimera’s sensor-exciter spacing (SES) is 2.11m, therefore pipe

segments shorter than 2.11m were not analyzed for Tavg to ensure that the Chimera was not

spanning between two or more separate pipes.

Due to manufacturing tolerances, fluctuations of ±15% in the individual PARW values are

common. Variations outside the ±15% spread can be an indicator of a different nominal wall

thickness or pipe type or point towards a problem like aggregate pitting or general wall loss. All

pipes that were analyzed in the 600mm (24in) Kildonan-Redwood Feeder Main fall within this

tolerance allowance, except pipe 0210. This pipe presented a clear baseline shift to a higher wall

thickness which was observable in all data sets. This suggests a different pipe type with a larger

nominal wall thickness (NWT) was used for stick 0210 in place of a pipe with a NWT of 7.9mm.


The vertical pipe segment 0340 was scanned with a lower frequency as the pipe has a thicker NWT

value (12.7mm) than the majority of the Main (7.9mm). The Tavg for this pipe segment was

12.7mm (100%).

Local Wall Thickness

Nine (9) pipes show evidence of pitting corrosion with a total of 18 localized pitting indications

reported. Of these 18 indications, 11 indications measured to be “shallow” (≥65% RW), and 7

indications measured to be “medium” (40-64% RW). Five of these indications have been reported

with low confidence. Confidence levels are assigned based on signal strength, noise levels, signal

reproducibility between RFT recordings, and sizing consistency between the recordings.

Table 4 details the three worst pitting indications per pipe (Tmin1, Tmin2 and Tmin3), as well as

the average (Tavg), minimum circumferential (Tcircmin) and maximum circumferential

(Tcircmax) remaining wall values for the inspected portion of the Kildonan-Redwood Feeder

Main.

Colour maps can highlight wall loss, wall gain, and material stresses within the pipe. Figure 24 to

Figure 34 in Appendix 1 show colour maps of the data for the medium-high confidence wall loss

indications. Defect indications are highlighted in the figures with bounding boxes.

If AECOM and the City decide to perform verification and repair work on the onshore portions of

the feeder main crossing, please let your PICA representative know. PICA can assist by providing

dig sheets for the selected areas.

Data Quality

Prior to the inspection of the Kildonan-Redwood Feeder Main, the 24-inch Chimera RFT ILI tool

was calibrated using a calibration pipe at PICA’s shop. Details about the calibration can be found

in Appendix 2.

Flange connections are difficult to assess. Flange pairs produce very large signals in the RFT data

due to the amount of material present; these large flange signals can mask small wall loss

indications at or adjacent to the connections. To mitigate the effects of the large RFT signal

indications from flange pairs, the Chimera tool was pulled through the Main alternating between

the detectors leading and exciter leading for each run. This maximizes the area of analyzable data

collected on either side of these connections.

The nominal pipe wall thickness of the vertical pipe is considerably thicker than the calibration

pipe. As a result, signal-to-noise levels are lower, and the one defect identified in the vertical

portion is reported with low confidence.


Table 4. Summary of pipe tally and wall thickness readings for the Kildonan-Redwood Feeder Main

Pipe List and Wall Thickness Readings – 600 mm (24in) Kildonan-Redwood Feeder Main

PICA Pipe

#

Pipe Location***

Tavg RW

Circumferential Wall Thickness

Local Wall Thickness**

Comments Start (m)

End (m)

Length (m)

Tcircmax RW

Tcircmin RW

Tmin1 Tmin2 Tmin3

RW Location

(m) Clock

Position** RW (%)

Location (m)

Clock Position

RW (%)

Location (m)

Clock Position

0010 0.00 0.68 0.68

Prelim zero datum is the pipe opening at the east end of the line

0020 0.68 1.43 0.75

Start weld concurrent with suspected Dresser Style 63 Connection Ring

0030 1.43 2.65 1.22

Start weld concurrent with suspected Dresser Style 63 Connection Ring

0040 2.65 5.75 3.10 102% 102% 102% -6.0° mitered vertical bend at start of segment

0050 5.75 16.39 10.64 97% 98% 97% -5.6° mitered vertical bend at start of segment

0060 16.39 28.57 12.18 103% 104% 102%

0070 28.57 40.62 12.05 100% 100% 99% 40% 37.20 4:30 66% 39.00 2:30 Two defect indications reported

0080 40.62 52.69 12.07 100% 101% 100%

mitered 6.2° vertical bend and 8° horizontal bend left (south) at start of segment



PICA Pipe

#

Pipe Location***

Tavg RW



Comments Start (m)

End (m)

Length (m)

Tcircmax RW

Tcircmin RW

Tmin1 Tmin2 Tmin3

RW Location

(m) Clock

Position** RW (%)

Location (m)

Clock Position

RW (%)

Location (m)

Clock Position

East side AGM is located at 46.51m

0090 52.69 64.85 12.16 98% 99% 97%

0100 64.85 77.06 12.21 98% 100% 97% 69% 66.03 3:00 One defect indication reported

0110 77.06 89.22 12.16 101% 102% 100%

0120 89.22 101.40 12.18 99% 101% 98% 72% 94.15 2:00

6.0° mitered vertical bend One defect indication reported

0130 101.40 113.59 12.18 102% 103% 101% 73% 113.01 10:00 One defect indication reported

0140 113.59 125.75 12.16 98% 99% 96%

0150 125.75 137.94 12.19 101% 103% 97% 55% 136.74 10:30 63% 137.15 9:30 66% 135.39 7:30 Four defect indications reported

0160 137.94 150.14 12.20 99% 100% 99% 46% 148.13 6:00 67% 138.92 11:30 Two defect indications reported

0170 150.14 162.22 12.08 100% 101% 99% 57% 159.19 11:00 62% 161.37 12:00 74% 154.17 2:30 Four defect indications reported

0180 162.22 163.76 1.54 30.0° mitered vertical bend at start of segment

0190 163.76 166.14 2.37 103% 104% 103%

-30.0° mitered vertical bend at end of segment. Possible water stop at 166.58m.



PICA Pipe

#

Pipe Location***

Tavg RW



Comments Start (m)

End (m)

Length (m)

Tcircmax RW

Tcircmin RW

Tmin1 Tmin2 Tmin3

RW Location

(m) Clock

Position** RW (%)

Location (m)

Clock Position

RW (%)

Location (m)

Clock Position

0200 166.14 170.43 4.29 101% 102% 100% West side AGM is located at 173.54m

0210 170.43 174.68 4.25 119% 121% 117%

Strap located at 172.6m. Possible water stop at 175.31m

0220 174.68 178.97 4.29 102% 105% 101%

0230 178.97 183.24 4.27 100% 101% 100% Strap located at 180.6m


0250 187.50 191.76 4.26 103% 103% 102%

0260 191.76 196.03 4.26 98% 99% 97% Straps located at 193.6m


0280 200.30 204.57 4.27 97% 98% 97%

0290 204.57 208.84 4.27 98% 99% 98% 56% 205.66 1:30 80% 206.24 11:30

Strap located at 206.4m Two defect indications reported


0310 213.11 217.37 4.26 104% 104% 104%


0330 221.65 225.60 3.95 103% 102% 101%

F 225.60 226.96 1.36* 90° elbow



PICA Pipe

#

Pipe Location***

Tavg RW



Comments Start (m)

End (m)

Length (m)

Tcircmax RW

Tcircmin RW

Tmin1 Tmin2 Tmin3

RW Location

(m) Clock

Position** RW (%)

Location (m)

Clock Position

RW (%)

Location (m)

Clock Position

0340 226.96 237.76 10.80 100% 103% 97% 70% 232.84 Not

available

Vertical west shaft. One defect indication reported. End datum at open flange face in west chamber.

*90-degree elbow length is estimated based on the dimensions of an AWWA 90˚ long sweep elbow as documented on pg266 of the CIPRA 1952 Cast Iron Pipe Handbook. **Clock positions are reported clockwise facing west. Clock positions are not available for defects in the vertical west pipe segment. ***Reported pipe segment lengths may not all be consistent with the segment start and end locations due to rounding.


Visual Inspection

A visual inspection was performed by PICA on the Kildonan-Redwood Feeder Main that was

accessible within the tunnel on the west side of the Red River. The portion of the Main that runs

through the tunnel is comprised of eleven (11) full pipe segments, eight (8) flange pairs, four (4)

Victaulic Couplings, seven (7) straps, and a total measured distance of 49.02m from the end of

the tunnel to the center of the flange connection between pipe 0330 and the 90-degree vertical

elbow.

Asphalt-dipped felt was used to coat the exterior of the pipeline during construction of the Main.

Though this coating was found to be in good condition over most of the accessible length, multiple

areas of interest were identified and recorded. These areas of interest included damage to the

coating in the form of gouges and scratches; imprints possibly left from transport or construction

equipment; and potential repair points. Figure 19 to Figure 23 show some of the anomalies that

were observed during the visual inspection. Note that the distances stated are measured from the

90-degree elbow flange connection at the bottom of the west shaft, east towards the end of the

tunnel. Clock positions described are referenced by facing west.

Figure 19. Coating anomaly observed at the 3 o’clock position on pipe 0300, at 13.8m from the center of the flange pair connecting the 90-degree elbow to the first horizontal pipe.


Coating ridges

Figure 20. Coating anomaly observed on pipe 0280, at 21.85m from the 90-degree elbow flange. Ridges can be seen pushed up in the coating, as well as what appears to be an imprint resembling fabric, possibly

caused by a transport strap.

Coating ridges

Figure 21. Coating anomaly observed on pipe 0270, at 26.4m from the 90-degree elbow flange.


Figure 23. Coating loss at 2 o’clock position on pipe 0220, 47.33m from the 90-degree elbow flange.

Figure 22. Divot observed in coating material at the 1:30 clock position on pipe 0310, 10.5m west from the 90-degree elbow.


Disclaimer – PICA Corporation

Scope of Services

The agreement of PICA Corp to perform services extends only to those services provided for in

writing. Under no circumstances shall such services extend beyond the performance of the

requested services. It is expressly understood that all descriptions, comments and expressions of

opinion reflect the opinions or observations of PICA Corp based on information and assumptions

supplied by the owner/operator and are not intended nor can they be construed as

representations or warranties. PICA Corp is not assuming any responsibilities of the

owner/operator and the owner/operator retains complete responsibility for the engineering,

manufacture, repair and use decisions as a result of the data or other information provided by

PICA Corp. Nothing contained in this Agreement shall create a contractual relationship with or

cause of action in favor of a third party against either the Line Owner or PICA Corp. In no event

shall PICA Corp’s liability in respect of the services referred to herein exceed the amount paid for

such services.

Standard of Care

In performing the services provided, PICA Corp uses the degree, care, and skill ordinarily

exercised under similar circumstances by others performing such services in the same or similar

locality. No other warranty, expressed or implied, is made or intended by PICA Corp.


Appendix 1: Colour Maps of Signal Indications

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Figure 24. Pipe 0070 colour map showing 66% remaining wall indication, 39.00 meters from the ZRD.


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Figure 25. Pipe number 0100 colour map showing 69% RW indication, 66.03 meters from the ZRD.


Figure 26. Pipe 0120 colour map of 72% RW indication, 94.15 meters from the ZRD.

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Figure 27. Pipe 0130 colour map showing 73% RW indication at 113.01 meters from the ZRD.

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Figure 28. Pipe 0150 colour map showing 75% RW indication, 126.73 meters from the ZRD.

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Figure 29. Pipe 0150 colour map showing the 66% RW, 55% RW, and 63% RW indications.

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Figure 30. Pipe number 0160 showing the 46% RW indication, 148.13m from the ZRD.


Figure 31. Pipe 0170 colour map showing 81% RW indication at 151.03m from the ZRD.

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Figure 32. Pipe 0170 colour map showing the 57% RW indication, 159.19m from the ZRD.


Figure 33. Pipe 0170 colour map showing the 62% RW indication, 161.37m from the ZRD.

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Figure 34. Pipe 0290 colour map with 56% RW and 80% RW indications shown.

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Appendix 2: RFT Tool Calibration

Prior to arriving on site, PICA performed a test run of the 24in Chimera tool in a 24in diameter,

9.5mm (0.375in) NWT, unlined spiral welded steel pipe to ensure that the tool was in proper

working condition. The calibration pipe contained 5.1cm diameter circular flat bottom defects of

varying wall loss percentages, and circular through holes (TH) of varying diameters. Machined

defects were measured with an Ultrasonic Testing (UT) device to confirm final wall thicknesses.

Table 5 provides an overview of the defects present in the calibration pipe.

Table 5. Defects machined into the 600mm diameter, 9.5mm (0.375in) NWT spiral welded steel calibration pipe

Defect Type Remaining Wall: Volume of Defect:

Circular Flat Bottom Defects 5.1 cm (2.0 in) diameter:

73% 5.2 cm3 (0.3 in3) 53% 9.1 cm3 (0.6 in3) 20% 15.4 cm3 (0.9 in3)

Diameter of Defect: Volume of Defect:

Circular Through Holes (0% RW):

1.3 cm (0.5in) 1.3 cm3 (0.1 in3) 2.5 cm (1.0in) 4.7 cm3 (0.3 in3) 5.1 cm (2.0in) 19.5 cm3 (1.2 in3)

7.6 cm (3.0in) 43.2 cm3 (2.7 in3) 10.2 cm (4.0in) 77.8 cm3 (4.7 in3)

Figure 35 show the circular flat bottom defects, and Figure 37 shows the circular through hole

defects machined into the calibration pipe. All defects were visible in the RFT scan of the

calibration pipe, including the 1.3cm (0.5in) diameter through hole and the 5.1cm x 73%RW flat

bottom defect. Figure 36 shows the RFT scan of the calibration pipe. It is important to note that

the results of the calibration may not be directly comparable to the 6.4 mm (0.250in) CML pipe

used to construct the Kildonan-Redwood Feeder Main due to the differences in nominal pipe wall

thickness and steel grade.

73%RW x 5.1cm

53%RW x 5.1cm

20%RW x 5.1cm

Figure 35. Calibration pipe with 73% RW, 53% RW, and 20% RW 5.1cm diameter flat bottom defects.


1.3 cm TH

2.5 cm TH

7.6 cm TH

10.2 cm TH

5.1 cm TH

Figure 37. Through holes machined into the 24in calibration pipe. Defects measured 1.3 cm, 2.5 cm, 5.1 cm, 7.6 cm, and 10.2 cm (0.5in, 1.0in, 2.0in, 3.0in, and 4.0in) in diameter.

Figure 36. Colour map produced of scanned calibration pipe showing flat-bottom and through hole defects.

10.2cm Ø

0%RW

7.6cm Ø

0%RW

5.1cm Ø

0%RW

2.5cm Ø

0%RW 1.3cm Ø

0%RW

5.1cm Ø

19%RW 5.1cm Ø

52%RW 5.1cm Ø

72%RW

2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6 0:00

3:00

6:00

9:00

12:00

Location (m)

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Appendix 3: Job Notes and Tool Log

Time (CST) Operational Comments

Mar 26, 2019 7:35 Inspection crew arrive on site at Kildonan-Redwood Feeder Main, West Chamber 7:40 First (mechanical Winch) skid steer off trailer 7:48 Laptop synced 8:20 Tool assembled 9:00 Odometer calibrated 9:14 Chimera tool powered up 9:32 Zeroed the wireline odometer with odometer wheel flush with pipe opening. 9:33 Tool scans at 7 Hz with detector leading as the tool begins its descent through the vertical

piping 9:45:15 Tool reaches bottom of vertical piping, begin to pull tool back up 10:40 Doing rerun at 5hz with Exciter leading 11:12 Stopped recording 11:14 Restart tool at 5Hz for detector leading run 12:06 East side crew leaves with tool in preparation for inspection of horizontal section. 13:30 Wireline odometer zeroed when Exciter end plate is flush with white painted pipe

opening at 13:30. Begin inspection with detector leading at 14 Hz. Start logging at 13:34.

15:13 AGM passage time (west side, AGM Q08874) 15:38 Tool arrived at 90 degrees elbow – start retrieve. 17:05 East side all packed up. Finished pulling tagline back into main from East to West. 17:20 Leave Site

Mar 27, 2019 7:43 Arrival at Kildonan West side. Tail gate safety meeting. 8:02 Tool is brought to East Chamber 9:00 Tagline is pulled out on the East side, bringing up west winchline. 9:19 Chimera tool powered up. Begin inspection of horizontal portion of Feeder Main at 14Hz.

10:10 Tool passing AGM P40171 on East side of river. 11:21 Tool passing AGM Q08874 on West side of river. 11:49 Tool arrived at 90-degree elbow. 11:59 Tool passing AGM Q08874 on West side of river. 13:02 Data download complete. 13:14 Startup Chimera tool for last 10 Hz run. 13:31 Tool launch east to west at 10Hz. 14:12 Tool passes AGMs on West side of river. 14:41 Tool arrived at 90-degree elbow, start retrieve. 15:16 Tool arrives at East chamber. 16:45 Leave site.

Mar 28, 2019 7:43 Arrive on site at Kildonan-Redwood, north excavation access.

10:25 Run Start north to south 11:02 Passage of AGM Q08874 on North side of river. 12:08 Tool arrives at south excavation 14:00 Winch slipped at South Chamber. Tool dropped and requiring repairs. 16:00 Zeroing wireline odometers with trailing conical pig 3 inch into the pipe. 16:08 Tool launch south to north. 16:38 Passage of AGM P40171 on South side of river. 17:21 Passage of AGM Q08874 on North side of river. 17:55 Tool arrives

Documents

City of Winnipeg...PICA, under contract with the City of Winnipeg (RFP 495-2018), inspected two 24in river crossing feeder mains for the City of Winnipeg using Remote Field Testing